Art of molding hollow articles in sand by means of divided patterns.



& T. REFSUM. ART OF MOLDING 'nOLLOW ARTICLES IN SAND BY MEANS OF DIVIDBD PATTERNS.

APPLICATION FILED 00121, 1907.

Patented June 22,1909.

IIIIIMIIIII""" IIIIIIIIIII/i UNITED STATES PATENT orrrca EDVARD REFSUM AND THOMAS REFSUM, OF DRAMMEN, NORWAY, ASSIGNORS TO BRODR. REFSUMS STOBERI & MEK, VAERKSTED, OF DRAMMEN, NORWAY, AND HOLST &

FLEISGHER. OF CHRISTIANIA, NORWAY.

ART or Monnme HOLLOW ARTICLES IN SAND BY arius or nrvrnnn PATTERNS.

Specification of Letters Patent.

Patented June 22, 1909.

Application filed October 1, 1907. Serial No. 395,445.

- way, have invented certain new and useful Improvements in the Art of Molding Hollow Articles in Sand by Means of Divided Patterns; and we do hereby declarethe following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make anduse the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

This invention relates to the art of molding hollow articles in sand by means of divided patterns and has for its object to provide means and a rocedure of working which gfeatly simpli es the molding of such artic es. I

Heretofore the core had to be formed for itself (sometimes from another material than the mold proper) and after special careful treatment, including very often a drying operation, to be placed in the mold so that the extremities of the core were supported in the cavities left in the mold by the coreprints on the pattern.

According to our invention this procedure is greatly simplified, our method enabling us to form the core simultaneously with forming the mold and of usual sand without any spe-' cial treatment, the core being formed within the divided pattern and the latter beingremovedfromthemold in such way, that the core will remain supported in the mold without having been removed from the place, where it was molded.

In order to explain our invention so that it may be fully understood,-we shall in connectionwith the annexed drawing describe how the iece of pipe to e cast.

the mold .for ashort piece of straight pipe, open in both ends, may be formed and how t e pattern forsuch workpiece is made. Any

one familiar with foundry practice will then easily be able to apply the invention to other work of more complicated form such as tees,

branchpipes, bends, traps, or hollowarticles closedin one or both ends.

. Figure 1 ma lon itudinal cal ongitudinal section through a flask, in

section through Fig, 2 1s a vertiwhich the pattern for forming the mold for casting the pipe shown in Fig. 1, is embedded in the sand. Fig. 3 is a cross section of the same. 4

The pattern is divided in two halves, each of which is composed ofthree portions viz:

the pattern proper A having outside and inside the'exact form of the outside and the inside of the pipe; the core prints B having outside and inside congruent surfaces; and a plate C forming a frame or basearound the two first named arts. The thickness of this plate corres )on s exactly to the thickness a: of the part of the thickness z of the pipe to be cast and as. It will-be seen, that in this manner-the 'sandbody D within'the pattern'will represent the core with projecting extremities. E is a measured at the to and the thickness 1 of the part A is exact y the sum.

with this pattern the halves ofthe pattern; the latter are then laced along each other and clapped together like a book. Some small tapered ins G on one of the halves corresponding. wit holes H in the other insures the correct fitting to gether of the pattern halves. The two.- halves of the pattern thus placed together are set upon the nowel supported by the flanges C, as shown in Fig. 2, and the cope is then placed overtha'nowel and attern containing the core. Sand is packe around one half of the pattern in the cope, in the wellknown manner, and the cope to ether with the upper half of the attern' an the entire core is removed from t e nowel. The nowel is now turned over and filledwith sand in the same manner; the half of the pattern in the nowel is removed and the latter placed. on top the cope and cord. The cope and nowel are now inverted, the cope removed from the nowel and the remaining half of the pattern removed from the cope, whereupon the latterv is again placed on the nowel and the mold s completed. p

It may of course be suitable to place some staples on the core before the nowel and cope are placed over it, especially when the pipe to be cast is long, or it is closed at one end,'so

the e-mre only at one end'has projections resting themold. If apiece of casting is to be east,'which is fully c10'sed,- s'o thatthe core can not/be supported by means of rojeetions, it will 'haveto be'supported eke usively by staples. 7 j v I MThen tees, brenehp' es etc, ate'to be cast, dorepihs will' have 'td e lsed, which may,

after the casting is ready, be taken to pieces;

:fi1hey being composed of sticks ita' ped 1:0.- "ggether-or eprpvifled with tapered an s fitting mtgo eorresponding holes.

"ll be easily under'st'o od the invention may also be used for molding more complieated holloweastings, necessitating the use- 0f several flasks 01' atterns divided in more Eben twopsrts 0f most importance e, how

ever, consider the invention. in its use fer "eastmg curved plpes havmg the Wells.

Chum:

A divided-pattern vcdmpx'ising' duplicate in testimony that we claim the feregoi'ng as our lx'lventlon, Wehave 's1gned 0u r names 1 m'presence of two subscrlbmg wltnesses.

EDVARD REFSUM. v THOMAS REFSUM. Witnesses? JOHQVAEQLER AUG. OLSEN. 

